97 eclipse p1105, p0443, p0141, p0136

SOURCE: Eclipse GST 1997/ car running fine then terrible/ 4 codes

yes bad ecu. exat same thing happened to a freind of mine he replaced maf, coolant sensor, distributor all that came trough check engine light. and still the same and chugged gas like crazy and fans were o always. i swapped his ecu with mine n car ran perfect. so he got new ecu and here he is driving happily to this day.

it was a 96 galant 2.4 sohc with around 75,000 miles.

good luck

Marvin

• 85242 Answers
• Posted on Oct 11, 2008

SOURCE: p0505 code with my 2000 mitsubishi eclipse

You will need to replace the IAC (idle speed control airbypass valve) it is near the ythrottle valve in the intake, it has either a black or gray connector going to it, don't confuse it with the throttle position sensor.

SOURCE: 2003 Mitsubishi Sypder Trouble Code P0141

thats nothing really to worry about the heater is use untill the exhaust gas is hot. like 400 degrees or somthing, thats were O2 sensors work the best. only for emmisons. won't effect your cars proformance

SOURCE: Emissions failing with high NOx

You need to check the oxygen sensor. You car may be running lean and therefore giving you increased NOx levels

SOURCE: 2000 Mitsubishi Eclipse will not idle, all else OK, just repl bat

I can only offer these few ideas.

1. The TP throttle position sensors for this year group fail often Pin 1 to Pin 4 resistance should be 3.6 to 6.3 ohms but you need to remove the two 7mm bolts that hold this sensor on the front side of the throttle body, then rotate the two bolstered center and see a change in resistance from low to high. If the resistance remains fixed, the sensor is rusted out and must be replaced.
2. The IAC motor is mounted on th LH side (driver's) of the throttle body. It should make a clicking sound when the key is turned from Lock to Run. Pin 2 to Pin 1, Pin 2 to Pin 3, Pin 5 to Pin 4, and finally Pin 5 to Pin 6 must all have continuity at 38 to 52 ohms.
3. Check for any vacuum leaks.
4. Remove clean and check EGR.
5. If this is a Cranks but will not start problem, check the owners manual for Theft Deterant UNLOCK proceedure. If there is power at the rear fuel pump relay coil and no power at the MFI/ASD front relay coil and no spark, then its the security system.